linux-kernel - Re: [PATCH v3 06/12] drm/bridge: Add Synopsys DesignWare MIPI DSI host controller driver

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Date:	Thu, 19 Nov 2015 13:29:24 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Chris Zhong <zyw@...k-chips.com>
Cc:	kbuild-all@...org, heiko@...ech.de,
	linux-rockchip@...ts.infradead.org,
	Mark Yao <mark.yao@...k-chips.com>,
	Chris Zhong <zyw@...k-chips.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Vincent Palatin <vpalatin@...omium.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Thierry Reding <treding@...dia.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Inki Dae <inki.dae@...sung.com>,
	Andy Yan <andy.yan@...k-chips.com>,
	David Airlie <airlied@...ux.ie>,
	Ajay Kumar <ajaykumar.rs@...sung.com>
Subject: Re: [PATCH v3 06/12] drm/bridge: Add Synopsys DesignWare MIPI DSI
 host controller driver

Hi Chris,

[auto build test WARNING on drm/drm-next]
[also build test WARNING on v4.4-rc1 next-20151118]
[cannot apply to rockchip/for-next]

url:    https://github.com/0day-ci/linux/commits/Chris-Zhong/Add-mipi-dsi-support-for-rk3288/20151119-114228
base:   git://people.freedesktop.org/~airlied/linux.git drm-next
config: xtensa-allmodconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All warnings (new ones prefixed by >>):

   In file included from arch/xtensa/include/generated/asm/div64.h:1:0,
                    from include/linux/kernel.h:136,
                    from include/linux/clk.h:16,
                    from drivers/gpu/drm/bridge/dw_mipi_dsi.c:10:
   drivers/gpu/drm/bridge/dw_mipi_dsi.c: In function 'dw_mipi_dsi_get_hcomponent_lbcc':
   include/asm-generic/div64.h:43:28: warning: comparison of distinct pointer types lacks a cast
     (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
                               ^
>> drivers/gpu/drm/bridge/dw_mipi_dsi.c:819:9: note: in expansion of macro 'do_div'
     frac = do_div(lbcc, dsi->mode->clock);
            ^
   drivers/gpu/drm/bridge/dw_mipi_dsi.c:819:2: warning: right shift count >= width of type
     frac = do_div(lbcc, dsi->mode->clock);
     ^
   In file included from arch/xtensa/include/generated/asm/div64.h:1:0,
                    from include/linux/kernel.h:136,
                    from include/linux/clk.h:16,
                    from drivers/gpu/drm/bridge/dw_mipi_dsi.c:10:
   include/asm-generic/div64.h:48:11: warning: passing argument 1 of '__div64_32' from incompatible pointer type
      __rem = __div64_32(&(n), __base); \
              ^
>> drivers/gpu/drm/bridge/dw_mipi_dsi.c:819:9: note: in expansion of macro 'do_div'
     frac = do_div(lbcc, dsi->mode->clock);
            ^
   include/asm-generic/div64.h:35:17: note: expected 'uint64_t *' but argument is of type 'u32 *'
    extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
                    ^

vim +/do_div +819 drivers/gpu/drm/bridge/dw_mipi_dsi.c

   803	static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
   804	{
   805		dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000));
   806		dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00);
   807		dsi_write(dsi, DSI_CMD_MODE_CFG, CMD_MODE_ALL_LP);
   808		dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
   809	}
   810	
   811	/* Get lane byte clock cycles. */
   812	static u32 dw_mipi_dsi_get_hcomponent_lbcc(struct dw_mipi_dsi *dsi,
   813						   u32 hcomponent)
   814	{
   815		u32 frac, lbcc;
   816	
   817		lbcc = hcomponent * dsi->lane_mbps * MSEC_PER_SEC / 8;
   818	
 > 819		frac = do_div(lbcc, dsi->mode->clock);
   820		if (frac)
   821			lbcc++;
   822	
   823		return lbcc;
   824	}
   825	
   826	static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi)
   827	{

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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